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1. 发明授权

US06292622B1 Method of low-speed reproducing in a video cassette recorder 失效
标题翻译：录像机中低速再现的方法
公开(公告)号：US06292622B1
公开(公告)日：2001-09-18
申请号：US09020172
申请日：1998-02-06
申请人： Jong-gyu Lee , Gyu-yeong Son
发明人： Jong-gyu Lee , Gyu-yeong Son
IPC分类号： H04N5783
CPC分类号： G11B5/0086 , G11B5/534 , G11B15/125 , G11B15/1875 , G11B15/4676 , H04N5/78263 , H04N5/783
摘要： A method for low-speed reproducing in a video cassette recorder (VCR) having a pair of main heads for normal-speed reproducing and at least a pair of additional heads neighboring said main heads is disclosed. A period which is regularly repeated from an envelope waveform of a video signal reproduced by said main heads is detected. The voltage level of the detected envelope waveform is then compared with a voltage level of the envelope waveform detected by the additional heads by generating a pseudo head switching pulse for switching the operation state of said main heads and additional heads according to the detected period. And, a reproduced signal from one of the said main and additional heads which has the envelope waveform having a high voltage level detected, thereby reproducing a high quality continuous time varying image without a noise.
摘要翻译：公开了一种在具有用于正常速度再现的一对主头和与所述主头相邻的至少一对附加头的盒式录像机（VCR）中进行低速再现的方法。检测从所述主磁头再现的视频信号的包络波形中规则地重复的周期。然后根据检测的周期，通过产生用于切换所述主磁头和附加磁头的操作状态的伪磁头切换脉冲，将检测到的包络波形的电压电平与由附加磁头检测到的包络波形的电压电平进行比较。并且，来自所述主磁头和附加磁头之一的再现信号具有检测到高电压电平的包络波形，从而再现高质量的连续时变图像而没有噪声。

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